Wago 4 level same potential terminal block din 35x75mm lock plain 727 series wago 727 227 wago 727 227 4 level same potential terminal block with locking clips for din rail 35x75mm plain complies with en60715 all clamping points are short circuited colour light grey 50pcs wago 727 227 4 level same potential block plain lock din 75mm light grey 50pk